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Old 10-30-2011, 11:15 AM
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to much pressure in radiator hose

I've got a friend that has a bbc 454 he has this problem with the radiator hoses getting so hard they well blow a hose we changed the head gasket,thermostat,radiator,new everything we could think of we don't think the head is cracked but it just might be but don't think so....I hope any help most appreciated

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Old 10-30-2011, 11:33 AM
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Quote:
Originally Posted by gaurdian101
I've got a friend that has a bbc 454 he has this problem with the radiator hoses getting so hard they well blow a hose we changed the head gasket,thermostat,radiator,new everything we could think of we don't think the head is cracked but it just might be but don't think so....I hope any help most appreciated
The pressure is coming from either the combustion chamber or from the high temp of the coolant.

Does the engine overheat, or does the coolant bubble and smell like exhaust? If so, it could be a head gasket. Or a cracked casting. Have you ran it sans thermostat just to see if there's a difference to eliminate it as the problem (or boil it in a pan of water, suspended off the bottom of the pan w/wire, etc.?)
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Old 10-30-2011, 12:23 PM
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no exhaust fumes at all the stat works tried the boiling water to see if the new one does work it don't ever overheat .....just builds up so much pressure.....
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Old 10-30-2011, 12:43 PM
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Either the cap is not working properly, try a new cap 14 psi. or overflow is blocked, make sure the tube next to to radiater fill is not twisted or crushed,and hose is not clogged. I have seen both.
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Old 10-30-2011, 12:58 PM
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Quote:
Originally Posted by gaurdian101
I've got a friend that has a bbc 454 he has this problem with the radiator hoses getting so hard they well blow a hose we changed the head gasket,thermostat,radiator,new everything we could think of we don't think the head is cracked but it just might be but don't think so....I hope any help most appreciated
He doesn't have the bypass blocked off, right?
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Old 10-30-2011, 01:16 PM
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the over flow not blocked or twisted got a 13 pound cap and still the same thing
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Old 10-30-2011, 02:09 PM
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get one of these. they make filling/burbing the cooling system easy. It is also shows a blown HG.

It didn't show up well in the camera but is obvious in person. It isn't too bad. I have seen HG's what would make it look like the water was boiling and had quite a bit of smoke.
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Old 10-30-2011, 08:11 PM
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Quote:
Originally Posted by gaurdian101
the over flow not blocked or twisted got a 13 pound cap and still the same thing
well if it has a 13 pound cap then it shouldn't build more than 13 pounds of pressure. If it is its not working right.
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Old 10-31-2011, 07:04 AM
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Quote:
Originally Posted by gaurdian101
the over flow not blocked or twisted got a 13 pound cap and still the same thing
Bypass, not over flow. If it's plugged off, there's a chance of localized hot spots that could- under the wrong circumstances- increase the cooling system pressure some. Red hose between W/P and intake, below:



But I'm wondering if what you're seeing is normal. The hoses will get hard when the system is hot, and if the hoses aren't tightened sufficiently- they will blow off.

Get a cap that's working, and tighten up the hose clamps and then watch the engine temp to see that it stays within normal range.
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